Official data from INPI

COMPOSICAO DE AGENTE PARA TRATAMENTO DE AGUA E PROCESSO PARA O DITO TRATAMENTO

ConcedidaInvention Patent

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Application data

Number

PI7601813

Type

Invention Patent

Filing

03/28/1975

Publication

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Progress at the INPI

Filing03/28/75
Publication
Examination
Allowance09/21/82
Grant06/28/83
Expired08/03/93

The letters patent expired on 08/03/1993: the term of protection has ended. The technology is in the public domain and may be freely used in Brazil.

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Latest action published by the INPI: 06/28/1983. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

KURITA WATER IND LTD

SANYO CHEMICAL IND LTD

Inventors

G. Y. (pessoa física)

K. T. (pessoa física)

Technical data

IPC Classification

C23F 14/02

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Concessão da patente

#16.1

06/28/1983

RPI 662

9.1.3

02/08/1983

RPI 642

Notificação para pagamento de retribuição

#13.1

01/25/1983

RPI 640

Deferimento

#9.1

09/21/1982

RPI 622

Exigência - art. 36 da LPI

#6.1

10/20/1981

RPI 574

Carta-patente expirada

#21.1

08/03/1993

RPI 1183

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